2. Click “Start.”
3. The program will send a testing message looped in th e copper segment
and display a pass/fail result.
Remote Loopback
Use a remote loopback (at the remote unit, set the designated DIP switch
to On; at the local unit, keep both loopback Dip switches Off/disabled) to
check that the ber segment is connected p roperly. Launch a loopback or
diagnostics testing program (see NOTE below) and follow the program
instructions. Typically, the instructions will be similar to the followi ng:
1. Enter the number of test messages (frame packets) to be sent (1–1000).
2. Click “Start.”
3. The program will send a testing message looped in th e ber segment
an d display a pass/fail result.
NOTE: On a PC, use a program such as Sniffe r to conduct the tests.
Other methods include the SmartBits series of testing eq uipment. If you
do not have access to either method, contact your vendor for advi ce.
IMPORTANT: Deactivate both the local and the remote loopback test
functions for normal converter operatio n.
Link Fault Signaling (LFS)
Link Fault Signaling (LFS) is an important function that is extremely
benecial in terms of network status monitorin g. The LFS function monitors
both the copper and ber segments to ensure that the Spannin g Tree
Protocol can kick in the moment a link failure occurs on either se gment.
Set LFS to On for normal operations; set to Off when install ing cables
or when testing the network connection.
NOTE: The LFS feature inuences both ber and c opper segments.
When disruption o ccurs on the co pper segment, t he ber segment wi ll be
disabled. When the ber segment loses signal, the cop per segment will
be disabled. Any link failure — including during periods of pr ecautionary
switching to the redundant link and during Link Fault Signaling — will
cause the ALM LED to light up (see LEDs).
To utilize the full benets of LFS, four converters can be used to build a
primary and a secondary path betwee n two switches. The switches must
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